The role of the intine and cytoplasm in the activation and germination processes of Poaceae pollen grains

Marquez, Jesus; Seoane-Camba, Juan; Suárez‐Cervera, María

doi:10.1080/00173139709362626

Cited by 27 publications

(9 citation statements)

References 64 publications

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“…However, microchannels were not identified in the foot layer of B. distachyon in the present study. The presence of more microchannels in the tectum than in the foot layer is a general observation for members of Poaceae (Skvarla and Larson 1966;Christensen et al 1972;Heslop-Harrison 1979;Marquez et al 1997b). In rice and maize, the presence of numerous microchannels, in both the tectum and the foot layer, has been reported; however, in the same study, the pennisetum pollen wall showed the absence of microchannels in the tectum and the foot layer (Fu et al 2001).…”

Section: Ontogeny Of the Pollen Wallmentioning

confidence: 76%

Ultrastructure of microsporogenesis and microgametogenesis in Brachypodium distachyon

2015

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Brachypodium distachyon has emerged as a model system for forage grass and cereal grain species. Here, we report B. distachyon pollen development at the ultrastructural level. The process of microsporogenesis and microgametogenesis in B. distachyon follows the typical angiosperm pollen development sequence. Pronounced evaginations of the nuclear envelope are observed prior to meiosis, indicating active nucleocytoplasmic exchange processes. The microspore mother cells undergo meiosis and subsequent cytokinesis, forming isobilateral tetrads. Following dissolution of the callose wall and release of free and vacuolated microspores, mitotic divisions lead to the formation of mature, three-celled pollen grains. In B. distachyon, pollen wall formation begins at the tetrad stage by the formation of the exine template (primexine). The exine is tectate-columellate, comprising a foot layer and endexine. Development of the tectum and the foot layer is complete by the free microspore stage of development, with the tectum formed discontinuously. The endexine initiates in the free microspore stage but becomes compressed in mature grains. The intine layer is deposited after mitosis and comprises three layers during the mature pollen stage of development. Pore development initiates during early free microspore development stage and Brachypodium pollen has a single germination pore consisting of a slightly raised annulus surrounding a central operculum. The tapetum is of the secretory type with loss of the tapetal cell walls beginning at about the time of microsporocyte meiosis. This is the first report on ultrastructure of microsporogenesis and microgametogenesis in B. distachyon. In general, Brachypodium microsporogenesis and microgametogenesis conform to a typical grass pollen development pattern.

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Section: Ontogeny Of the Pollen Wallmentioning

confidence: 76%

Ultrastructure of microsporogenesis and microgametogenesis in Brachypodium distachyon

2015

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“…Another possibility is that allergens could also be dispersed through the orbicules or Ubisch bodies from the anther wall, as well as through non-specific plant debris (Davis 1967;Pacini and Franchi 1993;D'Amato et al 2002;Vinckier and Smets 2001;Suárez-Cervera et al 2003, 2008a. The presence of labeled allergenic proteins in the orbicules was reported for Poaceae (El-Ghazaly et al 1999;Márquez et al 1997;Suárez-Cervera and SeoaneCamba 2005), Cupressaceae (Suárez-Cervera et al 2003, 2008a), Fraxinus (Rodriguez-Rajo et al 2010 and Parietaria. These orbicules are most likely involved in the dispersion of pollen grains, and they increase the allergen level in the air resulting in a higher risk of asthma.…”

Section: Pollen Counts Versus Protein Concentrationsmentioning

confidence: 87%

“…Thunderstorm episodes are two to three times more frequent in the Mediterranean PluviseasonalOceanic region of León than in Ourense during the Poaceae pollination period (Aemet 2009), and they could be a cause of the increase in aeroallergen concentrations. The abundant starch granules characteristic of the Poaceae cytoplasm (Taylor et al 1994;Márquez et al 1997) could be the source of new allergenic particles. Moreover, in Poaceae, numerous orbicules associated with allergens cover the surface of the anther (Márquez et al 1997;Suárez-Cervera and Seoane-Camba 2005) and may be dispersed into the atmosphere due to thunderstorm episodes.…”

Section: Pollen Counts Versus Protein Concentrationsmentioning

confidence: 99%

“…The abundant starch granules characteristic of the Poaceae cytoplasm (Taylor et al 1994;Márquez et al 1997) could be the source of new allergenic particles. Moreover, in Poaceae, numerous orbicules associated with allergens cover the surface of the anther (Márquez et al 1997;Suárez-Cervera and Seoane-Camba 2005) and may be dispersed into the atmosphere due to thunderstorm episodes.…”

Section: Pollen Counts Versus Protein Concentrationsmentioning

confidence: 99%

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The combination of airborne pollen and allergen quantification to reliably assess the real pollinosis risk in different bioclimatic areas

et al. 2010

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Exposure to allergens represents a key factor among the environmental determinants of asthma. The most common information available for pollinosis patients is the concentration of pollen grains in the bioaerosol and their temporal distribution. However, in recent years, discordance between pollen concentrations and allergic symptoms has been detected. The purpose of this research is to evaluate the relationship between pollen counts and the atmospheric aeroallergen concentrations in different Spanish bioclimatic areas. For the monitoring of allergen content in the air, a quantitative antigen-antibody technique combined with the Cyclone sampling methodology was used. The study was conducted during 2007 by considering some of the most common allergens that induce pollinosis in each area: Platanus and Urticaceae in Ourense and Cartagena, and Poaceae in Ourense and León. In Ourense, pollen counts and aeroallergen concentrations coincided for the three pollen types studied, and the pollen and allergen data associated with the meteorological factors were highly significant for the pollen counts. In Cartagena (for Platanus and Urticaceae) and León (for Poaceae), the low correlations between pollen counts and allergen concentrations obtained could be due to the specific bioclimatic conditions. In contrast, the higher allergen concentrations found in the atmosphere in Cartagena and León compared to Ourense could be related to the existing pollutant levels there, inducing a higher expression of plant pathogenesis-related proteins in the plants of polluted cities. The combination of pollen counts and allergen quantification must be assessed to reliably estimate exposure of allergic people to allergens in different bioclimatic areas.

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“…(Solanaceae; Fernández et al, 1992). In a number of studies, more elaborate intines were distinguished (Heslop-Harisson & Heslop-Harisson, 1991;Marquez et al, 1997aMarquez et al, , 1997bSuarez-Cervera et al, 2000, 2001a, 2001b.…”

Section: Pollen Ontogenymentioning

confidence: 99%

Pollen ontogeny linked to tapetal cell maturation inImpatiens parviflora(Balsaminaceae)

Vinckier

Janssens

Huysmans

et al. 2012

Grana

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The role of the intine and cytoplasm in the activation and germination processes of Poaceae pollen grains

Cited by 27 publications

References 64 publications

Ultrastructure of microsporogenesis and microgametogenesis in Brachypodium distachyon

Ultrastructure of microsporogenesis and microgametogenesis in Brachypodium distachyon

The combination of airborne pollen and allergen quantification to reliably assess the real pollinosis risk in different bioclimatic areas

Pollen ontogeny linked to tapetal cell maturation inImpatiens parviflora(Balsaminaceae)

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